论文标题
Magnetar旋转的故障为FRB样爆发和脉冲无线电插曲清理了道路
Magnetar spin-down glitch clearing the way for FRB-like bursts and a pulsed radio episode
论文作者
论文摘要
磁铁是孤立的中子恒星家族的特殊子集，其X射线和无线电发射主要由它们的巨大磁场衰减提供动力。磁铁的许多属性仍然鲜为人知：旋转的故障或恒星角动量的突然减少，无线电爆发让人联想到半乳酸外快速无线电爆发（FRB），以及持续数月至几年的瞬时脉冲无线电发射。在这里，我们从Magnetar sgr〜1935+2154 10月5日（+/- 1天）中揭示了检测大型旋转故障事件（$ |Δν/ν| = 5.8 _ { - 1.6}^{+2.6} \ times10^{ - 6} $）。我们发现对源持续的表面热或磁层X射线行为没有变化，也没有证据表明X射线爆发活性强。然而，在随后的几天中，磁铁发出了三个类似FRB的无线电爆发，然后发出了一个月的脉冲无线电发射。鉴于磁铁的稀有小故障和无线电信号的稀有性，它们的近似同步性表明了关联，为其起源提供了关键的线索和触发机制，并对较大的磁场和FRB种群产生了影响。我们假设脉冲的甲壳等离子体脱落接近磁极会产生一条弯曲磁场线的风，迅速降低了恒星的角动量，同时暂时改变了磁层场的几何形状，以允许对降低无线电发射所需的成对创造。
Magnetars are a special subset of the isolated neutron star family, with X-ray and radio emission mainly powered by the decay of their immense magnetic fields. Many attributes of magnetars remain poorly understood: spin-down glitches or the sudden reductions in the star's angular momentum, radio bursts reminiscent of extra-galactic Fast Radio Bursts (FRBs), and transient pulsed radio emission lasting months to years. Here we unveil the detection of a large spin-down glitch event ($|Δν/ν| = 5.8_{-1.6}^{+2.6}\times10^{-6}$) from the magnetar SGR~1935+2154 on 2020 October 5 (+/- 1 day). We find no change to the source persistent surface thermal or magnetospheric X-ray behavior, nor is there evidence of strong X-ray bursting activity. Yet, in the subsequent days, the magnetar emitted three FRB-like radio bursts followed by a month long episode of pulsed radio emission. Given the rarity of spin-down glitches and radio signals from magnetars, their approximate synchronicity suggests an association, providing pivotal clues to their origin and triggering mechanisms, with ramifications to the broader magnetar and FRB populations. We postulate that impulsive crustal plasma shedding close to the magnetic pole generates a wind that combs out magnetic field lines, rapidly reducing the star's angular momentum, while temporarily altering the magnetospheric field geometry to permit the pair creation needed to precipitate radio emission.
